Flame Retardant Finishing Of Polyester Based On The Limited Oxygen Index

Synthetic fibers and textiles such as polyester are widely used nowadays. But this kind of polymer material belongs to thermoplastic fibers, they are easy to burn and the fire is difficult to control after burning. The fire spreads easily, what’s more, molten drops fall will generate secondary damage. With the improvement of people’s living and Environment friendly flame retardant finishing trend of development, people put forward new requirements of high flame retardant performance of the polyester fabric.In the existing flame retardant polyester fiber, graft and copolymerization modification and process is relatively complicated and have high cost of development. Blending method has widespread problems such as poor compatibility and dispersity, puissant drop and so on. But finishing method can meet the requirements of different levels of flame retardant.It is still one of the important methods for polyester flame retardant. vertical burning method is adopted to improve the flame retardant performance In the past, limited oxygen index was less focused on.Although halogen flame retardants can achieve very good effect on flame retardant, limited oxygen index is higher than vertical burning method, but halogen flame retardants pollution is serious and produce poisonous gas in the combustion process, so it gets serious threat to the personal property safety. Therefore, This paper embarks from the above two points, trying to find a method not only improve the limited oxygen index, but also can meet the environmental requirements.The first part aims to improve the limited oxygen index value of polyester fabric,10-(2, 5-two carboxyl propyl)- 9, 10- dihydro- 9- oxygen mixed- 10- phosphorus mixed fe- 10- oxide halogen(DDP) is studied for it’s good flame retardant effect and environment-friendly effect.Firstly, the dosage of flame retardants was determined and then screen dispersant, study pH,zirconium bead dosage, the dosage of dispersants, rotating speed of ball mill, ball mill time’s influence on the properties of dispersion. after selecting the appropriate dispersant. The optimum dispersion process is: flame retardant agent is 2%, dispersant dosage is 0.08 g, dispersion of pH is5, zirconium bead dosage is 200 g, ball grinding time is 10 min, ball mill speed is 200 r/min. After choosing the best dispersion process, to polyester fabric was finished by using the good flame retardant liquid,explore the preliminary drying time, baking temperature, baking time and the p Hvalue, achieving the optimum flame retardant technology as follows: the pH of dispersion is 5,preliminary drying time is 6 min, the curing time is 2 min, baking temperature is 170 ℃.At the same time, the flame retardant mechanism of the flame retardant DDP is further demonstrated by TG and SEM analysis.The second part wants to further improve the limited oxygen index of polyester, The DDP esterifying liquid will be compounded with cyclic phosphat to improve the limited oxygen index of polyester further.at the same time, to chose another better adding type polyester flame retardant CEPPA esterifying liquid CEPPA- EG to compound with cyclic phosphate compound. The optimum dispersion process is: under the condition of the total amount of 180 g/L, the best ratio of DDP- EG and cyclic phosphate is 3:1,preliminary drying time is 8 min at 100℃, baking temperature is 190 ℃, the curing time is1 min. Finishing liquid pH value is 6.After the best finishing,the limited oxygen index value can reach 35.1.besides,under the condition of the total amount of 180 g/L, the best ratio of CEPPA- EG and cyclic phosphate is 3:1, preliminary drying time is 4 min at 100℃, finishing liquid pH value is 4. after finishing process, the limited oxygen index can reach 38.3.